Steam-whistle blank



2 Sheets--Sheet 1 (No Model.)

W. F. HEATH. STEAM WHISTLE BLANK.

' N0. 253,701; Patented Feb. 14,1882

V6 j [SLIP/M Z MW W (No Model.) I 2 Sheets-Sheet 2-.

W; F. HEATH;

STEAM WHISTLE BLANK.

No. 253,701. Patented Feb. 14,1882.

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WILBUB F. HEATH, OF FORT WAYNE, INDIANA.

STEAM-WHISTLE BLANK.

SPECIFICATION forming part of Letters Patent No. 253,701, dated February14, 1882, Application filed December 29, 1881. (No model.)

To all whom it may concern:

Be it known that I, WILBUR F. HEATH, a citizen of the United States ofAmerica, residing at Fort Wayne, in the county of Allen and StateofIndiana, have'invented certain new and useful Improvements inSteam-Thistle Blanks; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspecification.

Figure 1 is a transverse section of my improved blank for themanufacture of whistles and of the mold. Fig. 2 is a side elevation ofthe pattern which I have devised for making the mold. Fig. 3 is asectional view of the whistle completed. Fig. 4 is a front elevation.Fig. 5 is a perspective. Fig. 6 is a front view of a modified form ofthe whistle. Fig. 7 is a vertical section of the last said form. Fig. 8is a cross-section of the same.

practicable method for casting cheap blanks for the manufacture ofsteam-whistles. After the blanks are formed the whistle to be completedrequires only the simple operation of cutting a throat or embouchure.

In the drawings I have shown the mold which I have devised for castingmy improved blank, the pattern, and the core. After the pattern A hasbeen removed from the sand the cylinder-core B and the throat-core O aresecnredin position, the cores being provided with prints 1) and c. Themold is inclined, preferably by inclining one of its sides relatively tothe other, so that the cylinder-core B shall he supported centrally. Thecasting which is obtained is in cross-section, of the shape shown inFig. 1, this being the blank from which the whistle is made. It has astem or pipe-piece, A, provided with a thimble or collar, E, by which itcan be attached to any ordinary steampipe. This stem A flares or widensin all directions away from the end having the collar E until it reachesthe cylinder portion B, forming a chamber, A The cylinder B is hollow,but is bounded by the cylindrical wall D on all sides, except at thethroat d.

The object of the invention is to provide a In the blank the wall D, theend pieces, F F, and the stem or shank A are all in one piece, of metal.The core 0 provides a passageway or chamber in the shank A for thepassage of the steam, the stem being left as hollow as possible in orderto allow resonance. After the blank has been formed in the mannerdescribed the next step is to cut the slit or throat to 0pposite to thelip c at the edge of the wall D, this lip being made as thin as possibleto allow sufficient vibration to produce a good tone. The steam, afterit escapes through the throat a, impinges upon the lip or' edge c, someof it passing outwardly from said lip and some passing inwardly andaround the interior of the cylinder.

By following the mode described for making the blank and the whistle Iam enabled to reduce the cost of the manufacture much lower than that ofthe whistles as now made. The whistle,when completed, produces a moreperfect radiation of sound-waves, and therefore a louder and smoothertone, than can be produced by the devices now ordinarily employed. Undersome circumstances it may be found desirable to have the cylindricalpart of the whistle arranged vertically, as shown in Figs. 6, 7, and 8.In this case the steam passes upward through the passage-way in theshank A then through the vertically-situated narrow passage a and outthrough the slit or throat a. Blanks for whistles of the last saidcharacter can be made with two cores, in the manner described forwhistles of the other shape.

I do not herein claim the method of manufacturing steam-whistles which Ihave described, as I prefer to make that the subject-matter of anotherapplication which I intend to file.

What I claim isv The herein-described blank for steam-whistles, havingthe hollow stem A, the cylindrical part B, the ends F F, all cast in onepiece, and the throat d, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILBUR F. HEATH.

Witnesses:

GEo. H. SIBLEY, JOHN W. STUTZENBERGER.

